The incident happened when the monkey was playing around and suddenly reached a contact with a live wire that detached on the ground, when it was yelling for help due to so much pain the duck rushed into it and tries to remove off to its body but they just both electrocuted.

Their deep relationship as best friend since birth was a very touching story and inspires us, and to see how precious they value each other even to sacrifice their lives. This is a power of True Friends.